Method of providing for internal atmospheric expansion of filled bags and hermetically sealing same



' April 19, 1938.

R. M. BERGSTEIN METHOD OF PROVIDING FOR INTERNAL ATMOSPHERIC EXPANSION, OEFILLED BAGS AND HERMETICALLY SEALING SAME Filed March 4, 1937 2 Shets-Sheet 1 INV ENT OR.

ATTORNEY S- April 19,1938.

R. M. BERGSTEIN 2,114,523 METHOD OF PROVIDING FOR INTERNAL ATMOSPHERIC EXPANSION OE FILLED BAGS AND HERMETICALLY SEALING SAME 2 Sheets-Sheet 2 Fil ed March 4, 1957 FIG. 11.

INVENTOR. E0551? 7' [Vanna .fitkesrzm.

ATTORNEY43.

UNITED STATES PATENT OFFICE METHOD OF ATMOSPHERIC PROVIDING FOR INTERNAL EXPANSION OF FILLED BAGS AND HERMETICALLY SEALING SAIKE Robert Morris hergstein.

Cincinnati, Ohio. as-

signor to Edna May Bergstein and himself, as

trustees Application March 4. 1937. Serial No. 129.010

23 Claims.

My invention relates to a mode of sealing the open end of bags having contents therein, said J9EE}; being made of substantially impervious 'fixL le terLahpreferably heat scalable on the as a liner of carton, to further provide for a partial inward drawing of the opposite walls of the bag liner below the upper edges of the main body of the carton, so that after the Sealing has been closed over the i nterior surface at least, all seams of which are flaps of the carton h ca y sealedsealed bag liner. the atmosphere withi t This application is related to my application sealed bag can expand to the extent permitt d Serial Number 95.124 filed August 10th, 1936, and by the flattened portion of said bag liner within is intended to cover among other things th the interior of the carton. which bag has been 0 method divided out of said application. The sealed, and the bag material itself caneg s l 10 disclosure herein illustrates the method which to the limit permpg cart may be carried out by the mechanism described witho t bulging IL Mr TENT in said application. as well as the method that othewsolse'ts of this invention will appear as can be carried out by the mechanism described -the description of the invention proceeds.

in my co-pending application. Serial No. 131,738 In my co-pending application, se i l 15 flied March 18, 1937 or by other mechanical 66,650 filed March 2, 1936, I described a. bag means or by hand manipulation. made of substantially impervious material, the

The results which I produce in accordance inner surface of which is heat fusible, which with the method herein described, which can surface is integrally united at all seams, no

be carried out either by hand or by machine, re-entrant iolds being interposed between said 20 is to reduce the atmospheric volume within the Joints so t t t walls can be ally united bag coincident with closing it and. prior to efwithout pin holes which would be formed at lecting the final seal. then to produce t l infolded ends of reentrant folds, resulting in said by uniting hermetically portions or the two opposeam being l a -p and air-t ght. Such a a site mouth walls in a face to face relationship bag indep y as th in er liner of a with no folds intervening therebetween, to pro carbon. 0 be used for Purposes of retaining duce an air-tight liquid-tight s providing liqu ds 1' 8 n c mplishment not heretospace 101' interna l atmospheric expansion within tore attained in bags or flexible containers. To the'siledbig'flfirda'ftcfi'l thus' 'prov'icleadirect r t th s properties i t ag aft r face to face iusion between the interio urf it hasbeen tilled with contents and mouth sea1ed,- or said. walls by heat, to produce m t t it is necessary of course that the mouth be is integral with the interior surface of the bag sealed just as efleotively as the remaining bag material itself. joints, namely: by an air-tight and liquid-tight Another object of my invention i t cause a. -closure, or else the other properties of the sealed curving on straight line of a limited portion of bag wouidbelost. None of the bag-sealing meth- 35 said flattened area, extending entirely across ,ods in the present state of the art is capable said flattened area. to produce .an assured face of accomplishing this. to ace contact in said curving. and while in A mere fusion together of the entire mouth said curved position to apply heat t d unwed of a bag as has been proposed heretofore would to portion. In this way I am able to avoid any n t be adaptable to my W1 0! bag t e pressure during the sealing operation above that following reasons: which will bring about a contact and thus v id (1) If such an air-tight closure should be the danger of a poor seal when thebag sealing made on my type of bag. the atmosphere. having material is very soft from heat applied to it. no means of escape. would be entrapped w t n A still further object 0! my invention is to the .sealed bag mouth, permitting no folding 45 locate the seam or seams uniting said two opman p turning over of the mouth poslte walls of bag mouth above the line where after b in said two bag walls come together in flattened (2) with the atmosphere entrapped or enrelationship. so that the internal atmosphere of .closed to the full limit permitted by the sealed .so bag has room. thereafter to expand by filling -.bag, any increase in atmospheric volume for so out the flattened portion of bag below said seam. any of a variety of causes such as gases siven And I. stlli iurther object o! my invention is on by the contents. or the efiect of higher ternto accomplish all. the foregoing either in bags -pcratures,etc.. would have thrown asevere strain alone, or in bags which are used .as liners of on the bag so thatin most cases a leakage would e155 cartons. and in-the event 0! bags being used occur or the bag would burs-t v:

I. .:-1.- LT.- u 4 1 1 M'JII/A-IJ-W sub. .3 I. -1-!I- Now by my method as herein described an in Fig. 3, and incidental] air-tight and liquid-tight final seam is made the bag mouth. after the contents have been inserted, so that Thereafter, while retained in flattened posithe sealing joint is as effective as other joints tion, a fusion is effected between the interior surand the protection provided by the finished pacl-rfaces of the two walls in flat face to face relaage is substantially equal to that of the bag tionship, over a desired restricted portion of the material itself, and this is further done in such area, said seam or line of fusion being located a manner that an internal expansible area is above the apexes of the extending triangles allowed within the sealed bag, to compensate formed incidental to the flattening of the mouth. for an increase in the internal atmospheric vcl- As shown in Fig. 4 this seal is made by deflecting 10 urne. That I accomplish by sealing a zone above the bag walls into a curve thus obtaining comthe apexes of the divergent triangles of the plete contact and applying heat at the line of collapsed bag mouth. bend as at 3.

In the drawings: These steps can be carried out either by hand Figure 1 is a perspective of an open bag having tools or by machine, and while the bag is at rest the contents therein.

or in motion. It is also a matter of choice as Fig. 2 is a fragmentary perspective of the bag to whether the sealing is done while the flattened shown in Fig. l with the mouth thereof in spread portion is in upright position, or whether the y squeezes out air from position. flattened portion is retained in flattened condi- 0 Fig. 3 is a fragmentary perspective of the bag tion and folded to a desired angle as shown at 4 after the operation of flattening the mouth has in Fig. 5, and thereafter sealed as at 6 in the been performed. same manner as described. It is also a matter of Fig. 4 is a fragmentary perspective illustrating option as to whether the heat sealed joint be the seal extending across the upstanding mouth effected immediately following the sweeping toof the bag. gether to flatten the walls, or as part of the oper- 25 Fig. 5 illustrates an alternative method of ation which folds over the flattened portion to an forming the seal wherein the flattened portion of angle, or whether this be accomplished as a subthe bag is turned at a right angle to the position sequent step either while the flattened portion is shown in Fig. 4 before the sealing operation is upright or folded at any angle. If desired, a

performed. means can be employed in several successive 30 Fig.6 illustrates a bag or liner within a papersteps of the operation, either to form indeboard carton, the said bag or liner having been pendent heat sealed seams, or to operate sucsubjected to a spreading and a flattening operacessively on the same seam portion. tion and the flattened mouth of the bag sealed A common factor in all variations, however, is while in upstanding position. that the walls of the mouth are brought together Fig. 7 is a perspective similar to Fig. 6 except in flattened relationship, and while retained in that the sealing of the flattened mouth has been said flattened relationship the transverse face performed with the flattened portion in a turned to face seam is made, said seam being located down position.

above the apexes of the triangles formed inci- Fig. 8 is a sectional view through the flattened dental to the flattening, so that after having been mouth portion of a bag or liner and shows theresealed the internal atmosphere within the bag with a means for accomplishing the seal. can expand by filling the flattened portion below Fig. 8a illustrates an optional way of making a .the line of sealing; also the seal is much more seal. effective if made at a bent zone.

Fig. 9 shows one way of closing the end flaps In a hand operation a channel plate 2a can 5 of the carton.

be placed at one side of the walls 2 and a heated edge tool 2?) placed against the opposite side of the wall 2 and sufficiently advanced to effect a slight pushing of the bag material into the chan nel but without any pressure applied to the chanr Figs. 10 and 11 illustrate another and perhaps preferable way of closing the end flaps of the carton.-

Fig. 12 is a section along line |2--f2 of Fig. 11.

00 Fig. 13 is a sectional 'ew taken through two nclled plate through the bag material. Or else plies of heat sealable material showing a seal as in Fig. 8a, the deflected zone can be established formed therebetween. by turning the projecting bag mouth by a guide In my two above referred to applications, I 20, so that it curves over a heated plate 2i, or have shown mechanism of various kinds for makelse applying radiant heat to the curved portion. ing the desired seal, and for distending the bag The requirement for accomplishing the same mouth and wiping the walls of the bag together. result when the bag is used as a liner for a carton My present application is directed to the method is much the same. The main additional feature of. the aforesaid applications, and contemplates is that the flattening of the extending upper either machine or hand operations. walls of the mouth should also include a partial 0 As illustrated by the diagrams, my'invention is flattening of these bag walls within the main capable of a considerable variety of expressions. body of the carton itself. This is desirable so For example, considering first an independent that when the flaps of the carton have been bag I with contents therein as shown in Fig. 1, sealed or closed, with the sealed bag mouth inand having its inner lining at least of a readily side the carton, the atmospheric volume within heat fusible material, the mouth is elongated, or the sealed bag can expand by filling the flattened extended as by mechanical fingers or by hand as portion below the bag seal, and there will also be in Fig. 2. Then the two opposite walls are flatsufficient area available in the sealed carton to tened together as by mechanical sweepers. The permit expansion of the bag area itself within base of the completely flattened portion 2 may the limits permitted by the enclosing carton witheither be directly on the contents level or above out bulging the latter. the contents level with the slight tapering from The handling of the carton flaps themselves the base of the flattened portion to the contents form no part of my invention, and can be folded level itself. This second step brings the two or manipulated in any of the number of ways halves of the bag mouth flat together as shown now known in the present state of the art, just so they are in a non-obstructingposition for the operations on the bag-mouth. As illustrated in Fig. 9 of the drawings, when the seal I is accomplished while the flattened portion Q of the bag mouth is in upright position one of the side flaps I of the carton I can be folded in first,

thenthe opposite pair of flaps 9. which will bring in with them the extending triangular portlons of the bag liner, and then the final flap I I can be folded over, with no direct manipulation of the bagmouth liner itself being required. when the sealed bag mouth liner is folded to right angles so that it lies substantially within the plane bounded by the upper edges of the main body of the carton as indicated at II in Fig, 7, V the flaps can be folded in the order just described, also by folding inwardly of the flaps I, as shown in Fig. 10 the extending triangular portions i! of the bag liner can be folded in prior .to folding over the two side flaps Ill. Preferably .there is no direct manipulation of thewsealed mouth of the bag liner, as the normal folding and closing procedure of the carton flaps themselves serves to close or fold the bag material properly.

The essential feature of' my invention in regard to the seal itself is the flat face to face uniting of two opposite bag walls, by means of heat applied to a predetermined portion of the flattened area preferably applied without pressure except suflicient to form the curved zone with no folds intervening therebetween, so that the seambecomes integralwith the interior surface of the bag itself. The portion to be so united is located preferably well above the apexes of the triangles formed incidental to the flattening, for the further reason that directly at the apexes of these triangles. small wrinkled or infolded bag portions arelikely to occur, and any suck wrinkles or infolds or additional thicknesses of material prevent an effective face to face fusion required to obtain a hermetical closure.

My preferred method of eflecting the closure by bringing a desired portion of the two flat adjoining surfaces together in a curved or arched relationship is to assure a positive contact between the interiors of the two walls without substantial pressure, and while in said curved position to apply heat to the curved zone.

I preferably accomplish this curved relati'onship between the two adjoining flattened surfaces by means of a tongued element and a corresponding grooved element, which in maximum operative relation do not actually contact but which have a tolerance orclearance therebetween to avoid the distortion of the heat softened inner surfaces which would be caused by actual pressing.

As illustrated in my automatic machine the tongue and groove element may be either part of the sweepers used to flatten the extending walls of the bag, or part of the means used to fold over the flattened mouth of the bag, in either of which cases the tongue and groove come together to within the small tolerance mentioned above, and whil e\in said operative position heat is applied to the curved portion of the two flattened walls. In another mechanism the bag is retained in flattened position and .a portion passed between a stationery tongue and groove element, heat, being applied during its pamage through said element.

The curvature secures a positivecontact between the interior surfaces of the two adjoining wall portions, and it is very important to note application illustratin that according to my invention there is not actually any positive pressure applied, since there is' always a, tolerance between the tongue and slotted element, the reason being that pressure of any sort appliedafter heating, might distort the freshly softened interior portions and so prevent the desired hermetically fused seam.

I have not attempted to illustrate particular carton shapes or bag types in this specification. My novel method will apply to a wide variety of structures and in the claims that follow I wish to express the novel features of my method itself apart from particular forms or particular mechanical devices.

Having thus described my invention, which I claim as new and desire to secure by Letters Patent; is:--

1. A method of sealing bags whereby space is provided for internal expansion after final sealing which consists in collapsing the bag mouth and applying heat thereto in a zone located above the initial contact of the mouth walls a distance sufficient to accommodate fluid expansion within the bag. a

2. A method of sealing bags whereby space is provided for internal expansion after final sealing which consists in collapsing the bag mouth and applying heat thereto in a zone located above the initial contact of the mouth walls, said zone being established by curving the bag mouth without substantial pressure during heat application.

3. A method of making airand liquid-tight closure seams on the open end of a filled bag which consists of reducing the atmospheric volume within the interior by flattening together the opposite walls above the contents thereof, causing a curving of said flattened walls on at least one straight line, said line located above the apexes of the triangles formed due tothe flattening of said walls, and while in curved position causing heat to beapplied to the curved zone to result in a face to face fusion of the inner surfaces of walls substantially defined by said curvature, the spacing of said fused line being sufllciently spaced above said apexes to accommodate fluid expansion within the bag.

4. A method of providing space for atmospheric expansionwithin the interior of an hermetically sealed bag which consists of flattening the walls of said open mouth of bag after same has been filled with contents, thus causing a lessening ofatmospheric volume within the interior of said bag, and when in flattened position sealing the upper portion only of said flattened walls.

5. A method of making a liquid-tight and airtight seal ina filled bag having a heat fusible interior surface, consisting of flattening the open mouth causing the opposite walls to be brought face to face, causing a line of curvature across a predetermined portionof the flattened area above the peak of the triangles formed incidental to said flattening, and while in curved position to cause a. fusion of the inner surfaces at said line of curvature by means of heat, said fused line being sufiiciently spaced above said apexes to accommodate the subsequent internal expansion within the bag.

. 6. A method of making a liquid-tight and airtight seal in a filled bag having a heat fusible interior surface, consisting of flattening the open mouth causing the opposite walls to be brought d triangles formed incidental to said flattening,

and while in curved position tocause a. fusion of the inner surfaces at said line of curvature by means of heat, said fused line being sufllciently spaced above said apexes to accommodate the subsequent internal expansion within the bag.

'7. A method of sealing the open mouth of a fmaterial containing bag consisting of bringing together in flattened relationship the two opposite walls of said mouth, and thereafter uniting the interior surfaces of said two opposite walls by.

' means of heat over a predetermined limited portion of said flattened areaspaced away from the initial line of contact of the walls so as to provide a substantial expansion zone in the bag above the material therein.

8. A method of closing the mouth of a bag made of substantially impervious material having contents therein, which consists of bringing together in flattened position two opposite walls of said.

. tight seal above the base of the flattened portion, sufficiently to permit the subsequent expansion within the sealed bag.

1s. A method of sealing an extending mouth of a bag made of substantially impervious material I heat scalable on the interior at least which consists of effecting a flattened relationship between two opposite sides of said mouth with no additional thicknessoi material intervening, and while maintaining said flattened relationship bringing about a seal between said sides by heat, said seal being positioned sufllciently above the base of the flattened area topermit thesubsequent atmospheric expansion within theheat sealed bag.

11. A method of sealing an extending mouth of a bag made of substantially impervious material heat scalable on the interior at least which con.- sists of effecting a flattened relationship between two'opposite sides of said mouth with no additional thickness of material intervening, and while maintaining said flattened relationship bringing about a seal between said sides by heat, said seal being positioned sufliciently above the base of the flattened area to permit the subsequent atmospheric expansion within the heat sealed bag, and said seal being made by bringing a portion of the flattened area, extending entirely across the flattened area but at a distance above the base of said area,into curved relationship on a straight line, to assure positive contact incident to'sald curving, and applyi s heat to said portion whilein curved relationship to effect a fused hermetical seal.

12. A method of closing the mouth of a bag made of substantially impervious material ha'v ing contents therein, which consists of bringing together in flattened position two opposite walls of said mouth and while in flattened position. eflecting an air-tight seal at a distance above the base of the flattened portion, sufliciently to permit the subsequent expansion within the sealed bag and thereafter folding said flattened portion while retaining in flattened position and eflecting an hermetlcal seal. I

13. A method of closing mouthoi a bag oi said mouth and while made of substantially impervious material having contents, therein, which consists of bringing together in flattened relation two opposite walls in flattened relation effecting an air-tight seal above the base of the flattened portion, to permit expansion within the sealed bag and thereafter folding said flattened portion while retaining in flattened position eflecting an hermeticalseaLsaid seal being made by bringing a zone above the base of the flattened portion into arched condition and applying heat to the said area substantially defined by the arc.

14. A method of sealing hermetically the open mouth of a bag made of relatively impervious material, heat scalable on the interior at least, and

- with seams integrally united, whereby opposite walls of mouth are flattened with no folds intervening between said walls, and applying heat sufllciently above the juncture of said walls to fuse interior integrally, to thus provide space for the subsequent atmospheric expansion internally by means of the distending of the flattened area below the line defined by the seal.

15. A method of sealing the open mouth of a I liner made of substantially lmperviousmaterial, heat sealable on the interior at least and projecting from an end of a carton enclosing body portion of said liner, said carton having closing flaps attached to said end, which consists oi bringing opposite liner Walls together in fully flattened condition,-.and also to cause. a partial flattening of said walls on the interior of main body of said cotton, and while retaining the liner mouth in said condition effecting a face to face hermetical seal between said flattened walls above the apexes of triangular portions of liner formed incident to said flattening, whereby internal atmosphere within sealed liner is sufficiently reduced to permit.the sealed mouth to be readily foldable into the body of carton, whereby after the closing flaps of carton are secured the internal atmosphere can expand the partially flattened liner walls to the extent permitted by the expansion of the fully flattened portion below line of sealing.

16. A method ,of sealing the open mouth of a liner made of substantially impervious material Joined hermetically at all seams, the body of said liner'being-enclosed within a carton having closing flaps adjacent to open end thereof, said open mouth projecting from said open end of carton,

consistingof bringing opposite side mouth walls into, flattened contact causing a graduated taper of said walls from their lower line of contact to a point below the top edges of the carton, and while in said position eflecting an hermetlc'clmsure between walls along a line a substantial distance above-said lower line of contact, whereby the free flattened mouth walls may subsequently expand into the space-provided by said taper within the carton.

17. A method of sealing the extending open mouth of a liner the main portion of which is enclosed in an outer carton, said carton having closing flaps attached'to edges of'th'e open end adjacent to the open mouth of the liner, which consists of causing the complete flattening together oi the opposite walls of liner mouth, and partial flattening of said walls within the main body of carton, thereafter eflecting an hermetic seal a distance sufllciently above'the base or the completely flattened area that the expansible area within the sealed liner can expand to the extent that the cubic content of the main body of the carton wlllpermit.

18. A method otsealing the open mouth of a closing carton.

. 9,114,628 liner .whosebody is enclosed in-an outer car-.

ton which consists in: reducing the atmospheric volume oi the liner prior to the sealing and thereupon sealing said liner so .that the surface area of the liner below the line of sealing is substantially equal at least to the internal area of the carton body, and potential volumetric content within said sealed liner substantially equal to the cubic volume oi the carton body, to provide space for expansion of the flattened evacuated bag area below liner seal to the limit permitted by said en- 19. A method of sealing the open top of a contents containing liner whose body is enclosed within a carton having flaps appended to its open end, and which consists in securing said liner body to the main carton body a suiflcient distance belowthe upper edge of the main carton body to allow for bag expansion, then drawingtogether opposite walls of said open top of liner so that said walls extend in a graduated taper to the joint securing the main body of the liner to the main body oi the carton, and then sealing the said 'walls to each other with a substantial flattened portion below the seal.

20. A method of sealing a package comprising,

an outer carton having closing flaps adjacent to open end and enclosed within the body oi carton a liner having its open mouth extending beyond main body 01' carton intermediate said closing flaps which consists of iolding said closing flaps outwardly, elongating the top of the liner and sweeping said elongated walls together in flatt ed position, causing a partial contraction of walls within the main body of the carton,

thereafter bringing a section of the flattened walls above the apexes oi the triangular portions formed incidental to said flattening, intoicurved position in asubstantially straight line extending 4o completely across the flattened portion and applying heat to said curved section while so curved thereafter folding sealed liner top substantially into plane deflned by upper edges 0! main body of carton, tolding said carton closing and flaps inwardly to overlie said sealed liner top and thereafter securing said. carton closing flaps together. p

2 1.' A method of sealing a'package comprising an outer carton having closing flaps adJacent' to open end and enclosed within the body of carton.

' completely across the flattened area and applying heat to said curved section while so curved thereafter folding inwardly one set oi opposite closing flaps oi. said carton, and then folding inwardly the opposite pair of closing flaps and then securing said. flaps together.

22. A method of sealing the open mouthot a fllled bag which consists of bringing together in 'flattened position two opposite walls of the bag mouth, and applying heat in two successive steps to a predetermined portion of said flattened area. 23. The method 01 forming a closing seam in the 'open mouth of a filled-bag, the interior or said mouth at least being heat fusible which consists in flattening together opposite walls of said bag, deflecting va portion of said walls, and while so deflected applying heat substantially conflned to the deflected portion.

ROBERT MORRIS BERGSTIIN.

DISCLAIMER a 2,ll4,623.-Robert Morris BergateimCincinnati, Ohio. Mn'rnon or Pnov nnm-ron INTERNAL Amosrnnmc EXPANSION or FILLED BAGS AND HERMETICALLY SEALING SAME. Patent dated 1939, by the patentee and Edna ifrll 19, 1938. Disclaimer filed June 12,

ay Bergstein, as trustees.

Hereby enters this disclaimer as to claims 1, 4, 7, and 8 of said Letters Patent.

as follows:

As to I hereby disclaim from the method claimed any step of coils the bagmouth which does not include mechanical pressure applied from both sides to the'outside of the bag mouth.

I As to claim- 4, hereby disclaim from the method claimed, any step of flattening the walls of the open mouth which does not include mechanical pre'ssureapplicd from both'sidoe to .theoutside of the bag mouth.

As to claim 7, hereby from the method claimed, any etc of b 4 in-flattened relationshipoi the two opposite walls oi said mout not include mechanical mouth walls. As to claim together in flattened position, the two op include mechamcal pressure applied from [Ofic'hl Gazette Jaz 183939.

which oes PI'QS'ISUIQ applied from sides to the outside of the bag 8, hereby disclaim from the method claimed, any step of pgsite walls of said month, which does not th sides to the outside ofthe bag mouth closing carton.

. 9,114,628 liner .whosebody is enclosed in-an outer car-.

ton which consists in: reducing the atmospheric volume oi the liner prior to the sealing and thereupon sealing said liner so .that the surface area of the liner below the line of sealing is substantially equal at least to the internal area of the carton body, and potential volumetric content within said sealed liner substantially equal to the cubic volume oi the carton body, to provide space for expansion of the flattened evacuated bag area below liner seal to the limit permitted by said en- 19. A method of sealing the open top of a contents containing liner whose body is enclosed within a carton having flaps appended to its open end, and which consists in securing said liner body to the main carton body a suiflcient distance belowthe upper edge of the main carton body to allow for bag expansion, then drawingtogether opposite walls of said open top of liner so that said walls extend in a graduated taper to the joint securing the main body of the liner to the main body oi the carton, and then sealing the said 'walls to each other with a substantial flattened portion below the seal.

20. A method of sealing a package comprising,

an outer carton having closing flaps adjacent to open end and enclosed within the body oi carton a liner having its open mouth extending beyond main body 01' carton intermediate said closing flaps which consists of iolding said closing flaps outwardly, elongating the top of the liner and sweeping said elongated walls together in flatt ed position, causing a partial contraction of walls within the main body of the carton,

thereafter bringing a section of the flattened walls above the apexes oi the triangular portions formed incidental to said flattening, intoicurved position in asubstantially straight line extending 4o completely across the flattened portion and applying heat to said curved section while so curved thereafter folding sealed liner top substantially into plane deflned by upper edges 0! main body of carton, tolding said carton closing and flaps inwardly to overlie said sealed liner top and thereafter securing said. carton closing flaps together. p

2 1.' A method of sealing a'package comprising an outer carton having closing flaps adJacent' to open end and enclosed within the body of carton.

' completely across the flattened area and applying heat to said curved section while so curved thereafter folding inwardly one set oi opposite closing flaps oi. said carton, and then folding inwardly the opposite pair of closing flaps and then securing said. flaps together.

22. A method of sealing the open mouthot a fllled bag which consists of bringing together in 'flattened position two opposite walls of the bag mouth, and applying heat in two successive steps to a predetermined portion of said flattened area. 23. The method 01 forming a closing seam in the 'open mouth of a filled-bag, the interior or said mouth at least being heat fusible which consists in flattening together opposite walls of said bag, deflecting va portion of said walls, and while so deflected applying heat substantially conflned to the deflected portion.

ROBERT MORRIS BERGSTIIN.

DISCLAIMER a 2,ll4,623.-Robert Morris BergateimCincinnati, Ohio. Mn'rnon or Pnov nnm-ron INTERNAL Amosrnnmc EXPANSION or FILLED BAGS AND HERMETICALLY SEALING SAME. Patent dated 1939, by the patentee and Edna ifrll 19, 1938. Disclaimer filed June 12,

ay Bergstein, as trustees.

Hereby enters this disclaimer as to claims 1, 4, 7, and 8 of said Letters Patent.

as follows:

As to I hereby disclaim from the method claimed any step of coils the bagmouth which does not include mechanical pressure applied from both sides to the'outside of the bag mouth.

I As to claim- 4, hereby disclaim from the method claimed, any step of flattening the walls of the open mouth which does not include mechanical pre'ssureapplicd from both'sidoe to .theoutside of the bag mouth.

As to claim 7, hereby from the method claimed, any etc of b 4 in-flattened relationshipoi the two opposite walls oi said mout not include mechanical mouth walls. As to claim together in flattened position, the two op include mechamcal pressure applied from [Ofic'hl Gazette Jaz 183939.

which oes PI'QS'ISUIQ applied from sides to the outside of the bag 8, hereby disclaim from the method claimed, any step of pgsite walls of said month, which does not th sides to the outside ofthe bag mouth 

